Block top - The block number and length on the blockchain (in blocks) on generation of the present block Nonce - The transaction number for the from address (bear in mind this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://socialaffluent.com/story5849558/helping-the-others-realize-the-advantages-of-blockchain-explorer-one-https-forum-repetier-com-profile-coverjaguar3